page_to_index

Name:Get index of the page with in radix-tree* (TODO: remove once hugetlb pages will have ->index in PAGE_SIZE)

Proto:static inline unsigned long page_to_index(struct page *page)

Type:unsigned long

Parameter:

Type	Parameter	Name
struct page *	page

407

If Value is more likely to compile time(!PageTransTail returns true for both transparent huge pages* and hugetlbfs pages, so it should only be called when it's known* that hugetlbfs pages aren't involved.) Then Return Our offset within mapping.

414

pgoff = Our offset within mapping.

415

pgoff += page - compound_head(page)

416

Return pgoff

**Caller**
Name	Describe
truncate_inode_pages_range	runcate_inode_pages_range - truncate range of pages specified by start & end byte offsets@mapping: mapping to truncate@lstart: offset from which to truncate@lend: offset to which to truncate (inclusive) Truncate the page cache, removing the pages that
invalidate_mapping_pages	validate_mapping_pages - Invalidate all the unlocked pages of one inode@mapping: the address_space which holds the pages to invalidate@start: the offset 'from' which to invalidate@end: the offset 'to' which to invalidate (inclusive) This function only
invalidate_inode_pages2_range	validate_inode_pages2_range - remove range of pages from an address_space@mapping: the address_space@start: the page offset 'from' which to invalidate@end: the page offset 'to' which to invalidate (inclusive) Any pages which are found to be mapped

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